Vacuum flask for holding food



FIG. 1 is a top-front-right perspective view of a vacuum flask for holding food, showing the design;

FIG. 2 is a front elevation view of the vacuum flask for holding food of FIG. 1;

FIG. 3 is a rear elevation view of the vacuum flask for holding food of FIG. 1;

FIG. 4 is a top plan view of the vacuum flask for holding food of FIG. 1;

FIG. 5 is a bottom plan view of the vacuum flask for holding food of FIG. 1;

FIG. 6 is a right side elevation view of the vacuum flask for holding food of FIG. 1; and,

FIG. 7 is a left side elevation view of the vacuum flask for holding food of FIG. 1. 

CLAIM The ornamental design for a vacuum flask for holding food, as shown and described. 